Friction shock-absorbing mechanism



2 Sheets-Sheet l s. B. HASELTINE FRICTION sHocK ABsoRme MECHANISM Filed Feb. 9. 1924 wm s March 30 1926.

M. N N

Wb'fne i www March 30 1926.

1,578,312 S. E. HASELTINE FRICTION sHocK AsoRBING MECHANISM 2 Sheets-Shea?l 2 Filed Feb. 9. 1924 WM5 e5 Patented Mar.. so, 1926.

f UNITED STATES sTAcY B. vHAsnLfrmn, or CHICAGO, ILIntNoIs, AssrGNon, BY MEsnn ASSIGNMENTS; i

To w. n. MINER, INC., A ooRPoRATroN or DELAWARE.

PAT-ENTOFFICE.;

FnrcTIoN srroomAnsonnrNe.MEoHANrsivr.'

f Application led February, 1924. Serial No. 691,578.

To all whom t may concern: Beit known that I, STACY B. I-IAsnL'riNn,

a citizen of the United States, residing at.

release, and whereina differential wedge action is had during the compression of the mechanism.

Another object of the invention is to provide a mechanism of the character indicated, including a plurality of differentiall` wedge elements with whichv coact kmain spring resistance elements, wherein additional capacity is obtained vby employing independent, .auxiliary spring means also resisting movement of the wedge elements.

3 'Other objects and advantages of the indescription and claims hereinafter following. y

` -In thev drawings forming a part of this specification, Figure 1 is a horizontal, longitudinal, sectional view ofa portion of a raile t way draft rigging showing my improvements in connection therewith. Figure l2 is a front end elevation of the shockabsorbing mechanism proper. Figure 3 is a vertical, transverse, sectional view corresponding substantially to the line 3-3 of Figure 1. And Figures lland 5 are detail, perspective views of one ofthe friction yshoes and the combined yoke and wedge member respectively.

In vsaid drawing, 10-'-l0 denote the usual channel draft sills of a railway car underl frame, to the inner faces-of which are se cured front stop lugs 11 and rear stop lugs vention will more clearly.` appear from thev 12.' Av portion of thevdrawbar is at. 1?), the same being operatively associated with the shock absorbing mechanism proper disposed said mechanismand also a front follower V15.k The yokeA and partstherewithin are supportedin operative by a detachable saddle plate 16.- j

position ybya hooded cast yoke 14C, within whichmis Thel improved shock absorbing mecha-f;4

nism proper, as shown, comprises broadly, acombinedA friction shell yand spring cage casting A; twin arranged main springresistanceelements B-B; an auxiliary spring resistanceC;v a main spring follower D;

an auxiliary'spring follower E; apair of wedgel friction shoes F-F and a combined yoke and pressure-transmittingwedge mem#V I The casting A, as shown, `is formed with top and bottoml walls 17'-17, side walls 18%18 and an integral rear wall 19, the latter-functioning as the rear4 follower vof the mechanism. Theside walls 18 areleft comparatlvely short so as'to leave the majorl f portionof the-.sides [of the casting open to permit-the insertion and removal of lcertain parts. The sidev walls 18 areV provided on their inner faces with longitudinally extend side,an outer wedge face 22 and o'n its rearV side an inner1wedgeface-`23- Thewedge face 23 is preferably inclined at a blunter angle with reference to the longitudinal axis of the mechanism than the face 22. At its.

inner end, each shoe F is provided with a beveled face 24, the beveled faces 24 Adi verging inwardly of the mechanism and cooperating with .correspondingly inclined faces 124k on enlargements .25 provided on the front side of the twin spring follower' D. At the rear end, each shoe is also provided with a pair of rearwardly dispos-ed, laterally extending, spaced lugs 26, adapted to engagebehind the corresponding side wall 18` of the shell, thereby limiting the 'Y outward movement of each shoe and'inaintaining the parts in assembled relation. As

most clearly shown in Figure 4, theupper Y and lower ends of the enlargements 21 are spaced respectively from Vthe corresponding edges of the shoes, so that they will worlr freely within the yoke G. Y

The yolre G comprises parallel top and bottom arms 27 and front and rear end secn tions 28 and 29. Thearms 27 are adapted Vto embrace the projections 21 of the shoes and slide freely thereover. The section'28 is provided on the inner side thereof with a pair of rearwardly converging wedge faces V122--122 adapted to coact respectively with the wedge faces-22 'of the shoes. At the front end, the yoke G is provided with a .'fiat, transverseface 115 adapted to abut the The ymain spring resistance elements B are twin arranged, each comprising an inner ,relatively light coil and an outerV relatively heavier coil bearing on the rear wall of ythe l vshell and the rear face of the ina-in spring follower D respectively. v

rlhe spring follower E is in the form of a rectangular plate having wedge faces`123 yat the opposite sides edges thereof adapted to coa-ct respectively with wedge faces 23 of the shoes F. 'The spring resistance C which 'also comprises a relatively light coil and a relatively heavier outer coil is interposed between 'the spring follower E andthe rear end section 29 of the yoke G. v f y In assembling the mechanism, the spring resistance C, spring follower E Aand the shoes F are'iirst assembled with ythe yokeG'r, and while the parts are compressed by means of a clamp placed across shoes near the outerl end thereof, so that theV lugs 26will vclear'the side walls'18 of the shell, the assembled i members are inserted between the Nwalls 18 and upon expansion of the same, the lugs 26 areengage'd'behind the walls 18. 'The main lspring follower D and the spring resistance Velements B are inserted withinthe shell A through the vopenings provided iii the op posite sides thereof. In the'normal position shown in Figure 1, both springs B and C are held under a certain amount of compression.l

and'124 of the spring followers E and D, and` the faces 22'of the shoes slipping on the faces k122 of the wedge member G. Inward movement of the follower 15L is limited by engagement with the front end of the shell when the mechanism is-'fully compressed, the

forces then` "being, transmitted directly through the shell, which acts as a columnyload-sustaining means. y Upon removal-of the actuating force, the parts will be restoredV to their normal position by the expansion of the spring resistance elements B andy C, outward movement of the shoes F being limited by the lugs 26 as hereinbefore pointed out.

I/Vear of the various wedge and friction faces is compensated for by placing the springs C under preliminary compression when the parts of they 'mechanism' areasseinbled. j 1 r i' f 4 I have herein shown and described what As tlieshoes F are i I now consider the preferred manner of carrying out my invention but the saine is merely illustrative and yI vcontemplate all changes and modifications Vthat come within thev scope of the'clai'ms appended hereto.

I claim: v f

1.V In a friction shock absorbing mechaiiism, thecombination with a friction shell having interior friction surfaces; yof fric-n tion shoes'coacting with'said shell: friction surfaces; a yoke receiving the actuating force and transmitting force to the slices, said yoke having wedge means vthereon coacting with said shoes 5, and means for yieldingly'resisting movementof said shoes, said means including. a Vspring element` coacting withY said yoke. y

2. In a friction shock absorbing meclia nism, the combinationwith a friction shell having inwardly converging interior friction surfaces; of friction shoes coacting with said shell friction surfaces; a wedge pressuretransmitting member coacting with said shoes; abutment mea-ns on said member; and spring resistance elements coacting lwith said shoes to resist movement thereof inwardly of the, shell, certain of saidelements being operatively'interposed betweenV said shoes and abutment means. n y y Y 3. In a friction 'shock absorbing ymecha-y follower acting means, one of said follower acting means having converino' friction Z3 D FQ surfaces thereon; a pressure transmitting member coact-ing with the other of said fol.

nism, the combination with front and rear lower acting means, said member having wedge faces; fr'ction shoes coacting with said friction surfaces,y saidshoes having wedge faces thereon engaged bythe' wedge faces of said member; a spring resistance element operatively interposed between one of said follower acting means and said shoes; and an additional spring resistance element opposing inward movement of said slices, said last-named spring resistance element being interposed between said pressure transmitting member and said slices.

4;. In a friction shock absorbing mechanism, the` combination with end follower acting means, one of said follower acting means including a friction shell having interio`r 'friction surfaces, of a differential wedge system coacting with said shell, said system including a wedge pressure-transmitting member movable in unison with the other follower and friction slices; and spring resistance elements opposing movement of said shoes inwardly of .the shell, one of said elements being interposed between` the shoes.

and shell and the other of said elements being interposed between said shoes and wedgepressure-transmitting member.

5. In a friction shock absorbing mechanisiii, the combination with a friction shell having interior friction surfaces; of a differential wedge system coacting ,with said shell friction surfaces, said system including friction slices and a combined yoke and wedge member; and a spring resistance element opposing relative movement -of said yoke and shoes; and a second spring resistance element opposing relative movement of the shell and shoes.

6. In a friction shockv absorbing mechanism, the combination with a friction shell having interior, inwardly converging friction surfaces; of wedge friction shoes coacting with said surfaces; a yoke-having wedge means thereon engaging said slices; a main spring follower acting with said slices, anv

auxiliary spring follower coacting with said shoes; a spring resistance element coacting with said main spring follower and an auX- iliary spring resistance disposed within said yoke, and co-operating with said auxiliary spring follower.

7 In a friction shock absorbing mechanism, the vcombination with `a friction shell having converging interior friction surfaces; of a pressure-transmitting yoke having wedge means thereon; friction shoes coacting with said surfaces, each of said slices having a plurality of wedge faces thereon, one of which is adapted to be engaged by said wedge means; a pair of spring followers coacting with said slices, each of said spring followers having av wedge face thereon adapted to coact with one of the remaining wedge faces of each shoe; a main spring resistance element within said shell coacting `with-oneilof said followers; and an auxiliary spring resistance within said-yoke nism, the combination with a friction shell having inwardly converging interior friction surfaces; of a vyoke member; friction shoes coacting with said friction surfaces, said shoes and yoke having coacting wedge faces thereon; a pair of' spring followers engaging said shoes; twin arranged spring resistance elements within the shell coacting with one of said spring followers; and a spring resistance element disposed within the yoke and coacting with the remaining spring follower; y

10. In a friction 'shock absorbing mechanism, the combination with a friction shellv eoV having interior, converging friction sur-,

faces; of a yoke; friction slices coacting with said shell friction surfaces, said shoes and yoke having coacting wedge means thereon; means for yieldingly resisting inward movement ofV said shoes, said means including a spring resistance element disposed within said yoke; anda spring resistance co-operating with the shelll and a' coacting spring follower, said spring follower and shoes havingl coacting wedge-faces thereon. -l

11. In a friction shock absorbing'mechanism, the combination with a friction shell having interior, inwardly converging frio-- tion surfaces; of a yoke member; friction shoes coacting with said friction surfaces, said shoes and yoke having coacting wedge means thereon; means for yieldingly resisting movement of said shoes inwardly of the shell, said means including spring ele-` ments disposed within said yoke and shellM respectively; and a spring lfollower interposed between said slioes and the springre` sistance element within the shell, said spring follower and shoes having coacting wedge faces thereon.

l2. In a friction shock absorbing mechaa: l Y 1,578,312

yunit is contracted laterally, the spring bespring resistance for yielclngly resisting ing also ybodily movable With the unit; of relative movement between the 'said unit a friction shell havingfriction surfaces co and said shell. v v operable-With the friction shoes 0f said unit In Witness that I claim the foregoing yI and arranged t0 Gompel lateral contraction have hereunto subscribed my name this 6th of the latter vwhen the unit is moved in-Wardday of February, 1924. v

ly with respect to the shell; and a main STACY B. HASELTINE- 

